296 lines
8.6 KiB
C++
296 lines
8.6 KiB
C++
/* PDCH scheduler
|
|
*
|
|
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <gprs_bssgp_pcu.h>
|
|
#include <gprs_rlcmac.h>
|
|
#include <pcu_l1_if.h>
|
|
#include <bts.h>
|
|
#include <tbf.h>
|
|
|
|
static uint32_t sched_poll(struct gprs_rlcmac_bts *bts,
|
|
uint8_t trx, uint8_t ts, uint32_t fn, uint8_t block_nr,
|
|
struct gprs_rlcmac_tbf **poll_tbf,
|
|
struct gprs_rlcmac_tbf **ul_ass_tbf,
|
|
struct gprs_rlcmac_tbf **dl_ass_tbf,
|
|
struct gprs_rlcmac_ul_tbf **ul_ack_tbf)
|
|
{
|
|
struct gprs_rlcmac_ul_tbf *ul_tbf;
|
|
struct gprs_rlcmac_dl_tbf *dl_tbf;
|
|
struct llist_pods *lpods;
|
|
uint32_t poll_fn;
|
|
|
|
/* check special TBF for events */
|
|
poll_fn = fn + 4;
|
|
if ((block_nr % 3) == 2)
|
|
poll_fn ++;
|
|
poll_fn = poll_fn % 2715648;
|
|
llist_pods_for_each_entry(ul_tbf, &bts->ul_tbfs, list, lpods) {
|
|
/* this trx, this ts */
|
|
if (ul_tbf->trx->trx_no != trx || ul_tbf->control_ts != ts)
|
|
continue;
|
|
/* polling for next uplink block */
|
|
if (ul_tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
|
|
&& ul_tbf->poll_fn == poll_fn)
|
|
*poll_tbf = ul_tbf;
|
|
if (ul_tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_SEND_ACK)
|
|
*ul_ack_tbf = ul_tbf;
|
|
if (ul_tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS)
|
|
*dl_ass_tbf = ul_tbf;
|
|
if (ul_tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS)
|
|
*ul_ass_tbf = ul_tbf;
|
|
#warning "Is this supposed to be fair? The last TBF for each wins? Maybe use llist_add_tail and skip once we have all states?"
|
|
}
|
|
llist_pods_for_each_entry(dl_tbf, &bts->dl_tbfs, list, lpods) {
|
|
/* this trx, this ts */
|
|
if (dl_tbf->trx->trx_no != trx || dl_tbf->control_ts != ts)
|
|
continue;
|
|
/* polling for next uplink block */
|
|
if (dl_tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
|
|
&& dl_tbf->poll_fn == poll_fn)
|
|
*poll_tbf = dl_tbf;
|
|
if (dl_tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS)
|
|
*dl_ass_tbf = dl_tbf;
|
|
if (dl_tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS)
|
|
*ul_ass_tbf = dl_tbf;
|
|
}
|
|
|
|
return poll_fn;
|
|
}
|
|
|
|
static uint8_t sched_select_uplink(uint8_t trx, uint8_t ts, uint32_t fn,
|
|
uint8_t block_nr, struct gprs_rlcmac_pdch *pdch)
|
|
{
|
|
struct gprs_rlcmac_ul_tbf *tbf;
|
|
uint8_t usf = 0x07;
|
|
uint8_t i, tfi;
|
|
|
|
/* select uplink resource */
|
|
for (i = 0, tfi = pdch->next_ul_tfi; i < 32;
|
|
i++, tfi = (tfi + 1) & 31) {
|
|
tbf = pdch->ul_tbf_by_tfi(tfi);
|
|
/* no TBF for this tfi, go next */
|
|
if (!tbf)
|
|
continue;
|
|
/* no UL resources needed, go next */
|
|
/* we don't need to give resources in FINISHED state,
|
|
* because we have received all blocks and only poll
|
|
* for packet control ack. */
|
|
if (tbf->state_is_not(GPRS_RLCMAC_FLOW))
|
|
continue;
|
|
|
|
/* use this USF */
|
|
usf = tbf->m_usf[ts];
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
|
|
"TS=%d FN=%d block_nr=%d scheduling USF=%d for "
|
|
"required uplink resource of UL TFI=%d\n", trx, ts, fn,
|
|
block_nr, usf, tfi);
|
|
/* next TBF to handle resource is the next one */
|
|
pdch->next_ul_tfi = (tfi + 1) & 31;
|
|
break;
|
|
}
|
|
|
|
return usf;
|
|
}
|
|
|
|
static struct msgb *sched_select_ctrl_msg(
|
|
uint8_t trx, uint8_t ts, uint32_t fn,
|
|
uint8_t block_nr, struct gprs_rlcmac_pdch *pdch,
|
|
struct gprs_rlcmac_tbf *ul_ass_tbf,
|
|
struct gprs_rlcmac_tbf *dl_ass_tbf,
|
|
struct gprs_rlcmac_ul_tbf *ul_ack_tbf)
|
|
{
|
|
struct msgb *msg = NULL;
|
|
struct gprs_rlcmac_tbf *tbf = NULL;
|
|
struct gprs_rlcmac_tbf *next_list[3] = { ul_ass_tbf, dl_ass_tbf, ul_ack_tbf };
|
|
|
|
for (size_t i = 0; i < ARRAY_SIZE(next_list); ++i) {
|
|
tbf = next_list[(pdch->next_ctrl_prio + i) % 3];
|
|
if (!tbf)
|
|
continue;
|
|
|
|
if (tbf == ul_ass_tbf)
|
|
msg = ul_ass_tbf->create_ul_ass(fn);
|
|
else if (tbf == dl_ass_tbf)
|
|
msg = dl_ass_tbf->create_dl_ass(fn);
|
|
else if (tbf == ul_ack_tbf)
|
|
msg = ul_ack_tbf->create_ul_ack(fn);
|
|
else
|
|
abort();
|
|
|
|
if (!msg) {
|
|
tbf = NULL;
|
|
continue;
|
|
}
|
|
|
|
pdch->next_ctrl_prio += i + 1;
|
|
pdch->next_ctrl_prio %= 3;
|
|
break;
|
|
}
|
|
|
|
/* any message */
|
|
if (msg) {
|
|
tbf->rotate_in_list();
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control "
|
|
"message at RTS for %s (TRX=%d, TS=%d)\n",
|
|
tbf_name(tbf), trx, ts);
|
|
return msg;
|
|
}
|
|
/* schedule PACKET PAGING REQUEST */
|
|
msg = pdch->packet_paging_request();
|
|
if (msg) {
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling paging request "
|
|
"message at RTS for (TRX=%d, TS=%d)\n", trx, ts);
|
|
return msg;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct msgb *sched_select_downlink(struct gprs_rlcmac_bts *bts,
|
|
uint8_t trx, uint8_t ts, uint32_t fn,
|
|
uint8_t block_nr, struct gprs_rlcmac_pdch *pdch)
|
|
{
|
|
struct msgb *msg = NULL;
|
|
struct gprs_rlcmac_dl_tbf *tbf = NULL;
|
|
uint8_t i, tfi;
|
|
|
|
/* select downlink resource */
|
|
for (i = 0, tfi = pdch->next_dl_tfi; i < 32;
|
|
i++, tfi = (tfi + 1) & 31) {
|
|
tbf = pdch->dl_tbf_by_tfi(tfi);
|
|
/* no TBF for this tfi, go next */
|
|
if (!tbf)
|
|
continue;
|
|
/* no DL TBF, go next */
|
|
if (tbf->direction != GPRS_RLCMAC_DL_TBF)
|
|
continue;
|
|
/* no DL resources needed, go next */
|
|
if (tbf->state_is_not(GPRS_RLCMAC_FLOW)
|
|
&& tbf->state_is_not(GPRS_RLCMAC_FINISHED))
|
|
continue;
|
|
|
|
/* waiting for CCCH IMM.ASS confirm */
|
|
if (tbf->m_wait_confirm)
|
|
continue;
|
|
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data message at "
|
|
"RTS for DL TFI=%d (TRX=%d, TS=%d)\n", tfi, trx, ts);
|
|
/* next TBF to handle resource is the next one */
|
|
pdch->next_dl_tfi = (tfi + 1) & 31;
|
|
/* generate DL data block */
|
|
msg = tbf->create_dl_acked_block(fn, ts);
|
|
break;
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
static const uint8_t rlcmac_dl_idle[23] = {
|
|
0x47, /* control without optional header octets, no polling, USF=111 */
|
|
0x94, /* dummy downlink control message, paging mode 00 */
|
|
0x2b, /* no persistance level, 7 bits spare pattern */
|
|
0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
|
|
0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b
|
|
};
|
|
|
|
static struct msgb *sched_dummy(void)
|
|
{
|
|
struct msgb *msg;
|
|
|
|
msg = msgb_alloc(23, "rlcmac_dl_idle");
|
|
if (!msg)
|
|
return NULL;
|
|
memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23);
|
|
|
|
return msg;
|
|
}
|
|
|
|
int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
|
|
uint8_t trx, uint8_t ts, uint16_t arfcn,
|
|
uint32_t fn, uint8_t block_nr)
|
|
{
|
|
struct gprs_rlcmac_pdch *pdch;
|
|
struct gprs_rlcmac_tbf *poll_tbf = NULL, *dl_ass_tbf = NULL,
|
|
*ul_ass_tbf = NULL;
|
|
struct gprs_rlcmac_ul_tbf *ul_ack_tbf = NULL;
|
|
uint8_t usf = 0x7;
|
|
struct msgb *msg = NULL;
|
|
uint32_t poll_fn, sba_fn;
|
|
|
|
#warning "ARFCN... it is already in the TRX..... is it consistent with it?"
|
|
|
|
if (trx >= 8 || ts >= 8)
|
|
return -EINVAL;
|
|
pdch = &bts->trx[trx].pdch[ts];
|
|
|
|
if (!pdch->is_enabled()) {
|
|
LOGP(DRLCMACSCHED, LOGL_ERROR, "Received RTS on disabled PDCH: "
|
|
"TRX=%d TS=%d\n", trx, ts);
|
|
return -EIO;
|
|
}
|
|
|
|
/* store last frame number of RTS */
|
|
pdch->last_rts_fn = fn;
|
|
|
|
poll_fn = sched_poll(bts, trx, ts, fn, block_nr, &poll_tbf, &ul_ass_tbf,
|
|
&dl_ass_tbf, &ul_ack_tbf);
|
|
/* check uplink resource for polling */
|
|
if (poll_tbf)
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
|
|
"TS=%d FN=%d block_nr=%d scheduling free USF for "
|
|
"polling at FN=%d of %s\n", trx, ts, fn,
|
|
block_nr, poll_fn,
|
|
tbf_name(poll_tbf));
|
|
/* use free USF */
|
|
/* else. check for sba */
|
|
else if ((sba_fn = bts->bts->sba()->sched(trx, ts, fn, block_nr) != 0xffffffff))
|
|
LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
|
|
"TS=%d FN=%d block_nr=%d scheduling free USF for "
|
|
"single block allocation at FN=%d\n", trx, ts, fn,
|
|
block_nr, sba_fn);
|
|
/* use free USF */
|
|
/* else, we search for uplink resource */
|
|
else
|
|
usf = sched_select_uplink(trx, ts, fn, block_nr, pdch);
|
|
|
|
/* Prio 1: select control message */
|
|
msg = sched_select_ctrl_msg(trx, ts, fn, block_nr, pdch, ul_ass_tbf,
|
|
dl_ass_tbf, ul_ack_tbf);
|
|
|
|
/* Prio 2: select data message for downlink */
|
|
if (!msg)
|
|
msg = sched_select_downlink(bts, trx, ts, fn, block_nr, pdch);
|
|
|
|
/* Prio 3: send dummy contol message */
|
|
if (!msg)
|
|
msg = sched_dummy();
|
|
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
/* msg is now available */
|
|
|
|
/* set USF */
|
|
msg->data[0] = (msg->data[0] & 0xf8) | usf;
|
|
|
|
/* send PDTCH/PACCH to L1 */
|
|
pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr);
|
|
|
|
return 0;
|
|
}
|